RE: [Xen-devel] starting domain when block device already mounted

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

My disks line is:

disk = [ 'phy:vg00/mail,0301,w', 'phy:vg00/mail-swap,0302,w' ]

The unpriv domain is up and running again, although I don't know what
damage has been done. /etc/passwd was missing though which is not a good
sign. I found it in /lost+found, but who knows what else is missing!

Thanks

James

> -----Original Message-----
> From: Ian Pratt [mailto:m+Ian.Pratt@xxxxxxxxxxxx]
> Sent: Monday, 17 January 2005 09:34
> To: James Harper; xen-devel@xxxxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] starting domain when block device already
mounted
> 
> > I just had a filesystem hosed in an unpriv domain (ext3
> > errors all over
> > the place), and then when I went to do a fsck on the block device it
> > told me it was already mounted, and sure enough, dom0 already had
the
> > device mounted. Would that cause a filesystem crash, or at
> > least errors?
> > Dom0 wasn't doing anything to the filesystem, and the unpriv
> > domain had
> > been up for a few weeks before this occurred.
> 
> Mounting an ext3 file system writeable in two domains is almost
certain
> to destroy it.
> 
> The tools try and prevent this. Was it a 'file:' vbd? There's
currently
> no safety checks for those, but there should be for physical partition
> and LVM volumes.
> 
> Ian
> 
> > Anyway, I've done this a few times before by mistake - made a few
> > changes to the unpriv domain's filesystem from dom0 and forgot to
> > unmount it before starting the domain. Is there any easy way
> > to get 'xm
> > create' to check before starting that none of the block devices it
is
> > about to export are in use? Such a thing would probably save me
> > countless headaches in the future! (or maybe it's been done
> > already? I'm
> > running 2.0.1)
> >
> > Thanks
> >
> > James
> >
> >
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